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=head1 NAME

ossl_cmp_asn1_octet_string_set1,
ossl_cmp_asn1_octet_string_set1_bytes,
ossl_cmp_build_cert_chain
- misc internal utility functions

=head1 SYNOPSIS

 #include "cmp_local.h"

 int ossl_cmp_asn1_octet_string_set1(ASN1_OCTET_STRING **tgt,
                                     const ASN1_OCTET_STRING *src);
 int ossl_cmp_asn1_octet_string_set1_bytes(ASN1_OCTET_STRING **tgt,
                                           const unsigned char *bytes, int len);

 STACK_OF(X509) *ossl_cmp_build_cert_chain(STACK_OF(X509) *certs, X509 *cert);

=head1 DESCRIPTION

ossl_cmp_asn1_octet_string_set1() frees any previous value of the variable
referenced via the I<tgt> argument and assigns either a copy of
the ASN1_OCTET_STRING given as the I<src> argument or NULL.
It returns 1 on success, 0 on error.

ossl_cmp_asn1_octet_string_set1_bytes() frees any previous value of the variable
referenced via the I<tgt> argument and assigns either a copy of the given byte
string (with the given length) or NULL. It returns 1 on success, 0 on error.

ossl_cmp_build_cert_chain() builds up the certificate chain of cert as high up
as possible using the given X509_STORE containing all possible intermediate
certificates and optionally the (possible) trust anchor(s).

=head1 RETURN VALUES

ossl_cmp_build_cert_chain()
returns NULL on error, else a pointer to a stack of (up_ref'ed) certificates
containing the EE certificate given in the function arguments (cert)
and all intermediate certificates up the chain toward the trust anchor.
The (self-signed) trust anchor is not included.

All other functions return 1 on success, 0 on error.

=head1 HISTORY

The OpenSSL CMP support was added in OpenSSL 3.0.

=head1 COPYRIGHT

Copyright 2007-2019 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.

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